turnip: Advertise 8 bit subpixel precision

Previously, turnip advertised 4-bit subpixel precision when in
practice, a6xx seems to render with 8-bit precision. This caused
dEQP-VK.renderpass2.suballocation.subpass_dependencies.late_fragment_tests.*
to fail because they compare images rendered with turnip against
ones rendered via a software reference implementation parameterized
by turnip's VkPhysicalDeviceLimits.subPixelPrecisionBits value.

Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4172>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4172>

diff --git a/src/freedreno/vulkan/tu_device.c b/src/freedreno/vulkan/tu_device.c
index 0f72ddf..f8c856e 100644 (file)
--- a/src/freedreno/vulkan/tu_device.c
+++ b/src/freedreno/vulkan/tu_device.c
@@ -803,7 +803,7 @@ tu_GetPhysicalDeviceProperties(VkPhysicalDevice physicalDevice,
       .maxComputeWorkGroupCount = { 65535, 65535, 65535 },
       .maxComputeWorkGroupInvocations = 2048,
       .maxComputeWorkGroupSize = { 2048, 2048, 2048 },
-      .subPixelPrecisionBits = 4 /* FIXME */,
+      .subPixelPrecisionBits = 8,
       .subTexelPrecisionBits = 4 /* FIXME */,
       .mipmapPrecisionBits = 4 /* FIXME */,
       .maxDrawIndexedIndexValue = UINT32_MAX,